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Патент USA US3083468

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April 2, 1963
J. B. BLYDENBURGH
3,083,464
SURVEYOR’S TRANSIT THEODOLITE CHAINING ATTACHMENT
Filed Feb. 12. 1960
He. 4
2 Sheets-Sheet 1
April 2, 1963
J. B. BLYD'ENBURGH
3,083,454
SURVEYOR’S TRANSIT THEODOLITE CHAINING ATTACHMENT
Filed Feb. 12, 1960
2 Sheets-Sheet 2
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United States Patent 0
1
3,083,464
.SURVEYGR’S TRANSIT THEUDOLITE CHAINING
ATTACHMENT
John B. Blydenburgh, 727 Fort Salonga Road,
Northport, N.Y.
Filed Feb. 12, 1960, Ser. No. 8,422
6 Claims. (Cl. 33-1)
3,083,464
Patented Apr. 2, 1963
2
the chain with either as it maybe viewed from either of
the two lines 7--7 therein; and
FIG. 8 is an enlarged side elevational view of a modi
?ed form of the attachment of the present invention.
Referring to the drawings, in which like numerals iden
tify similar parts throughout, it will be seen from FIGS. 1
to 4 incl. that an embodiment of the present invention,
indicated at 10, may comprise an elongated frame means
The present invention relates to .surveyor’s transit
11, translating screw means 12 and a traveler 13. The
theodolites (hereinafter called “transit” or “gun” in ac 10 frame means 11 preferably includes an elongated frame
cordance with conventional surveying practice) and
plate 14 having a longitudinally-extending ?at side or ver
means thereof to facilitate chaining a line or the distance
tical face 15 and provided at its opposite ends with a
between two remote stations.
pair of support arms 16 and 17 extending angular-1y there
A general object of the present invention is to pro
from in longitudinally-spaced relation. Preferably the
vide an attachment for a transit which is simple in con 15 support arms 16 and 17 extend laterallyoutward from
struction and readily mounted thereto and provides a
the side face 15 and substantially normal thereto, and
ready means for compensating for differences between
may be formed as integral end portions of the frame
plate.
successive transit set-ups between stations a plurality of
chains apart and the actual distances between these set
The translating screw means 12 is rotatably supported
up points, and which facilitates in an e?icient and simple 20 by the support arms 16 and 17 and, for this purpose, each
manner other chain measurements effected with the use
support arm may have a through bore ?tted with a sleeve
of a transit equipped therewith.
A more speci?c object of the invention is to provide
such an attachment characterized by screw adjustable
bearing 18 to provide a longitudinally-spaced pair there
of, as is indicated in FIG. 4.
The screw means 12 pref
erably may be in the form of a shaft 19‘ having longitudi
means for supporting a chaining tape along the optical 25 nally-spaced journal sections 20, 20 rotatably received
axis of the transit telescope at points offset along this axis
through the bearings 18, 18, and an externally-threaded
from the axis of the telescope axle or shaft for ready
section intervening these bearings and the support arms
cumulative or direct determination of such offset dis
tances.
16 and 17 in which the latter are mounted. The threads
of the threaded section of screw shaft 19 may have a
A further object of the invention is to provide struc
pitch of the order of thirty-two threads per inch (32
tural embodiments of the device which are readily con
th./in.), or any other pitch which one may prefer. Pref
erably one end 21 of the screw shaft is headed to provide
an annular shoulder 22 rotatably abutted to end face 23
of support arm 16. The other end 24 of screw shaft 19
structed and allow e?icient use and operation thereof.
Other objects of the invention will in part be obvious
and will in part appear hereinafter.
The invention accordingly comprises the features of 35 projects appreciably beyond the end face 25 of support
arm 17 and may be surrounded adjacent the latter with a
construction, combinations of elements, and arrangements
of parts, which will be exempli?ed in the constructions
thrust washer 26. Upon the shaft end 24- is ?xed, such as
hereinafter set forth, and the scope of the invention
by a drift pin 27, a knurled hand knob 28 for manual
will be indicated in the claims.
manipulation or rotation of screw shaft 19. Thus, in the
For a fuller understanding of the nature and objects 40 rotation of screw shaft 19 by the manual knob 28, longi
of the invention reference should be had to the following
tudinal movement thereof is prevented by the headed end
detailed description taken in connection with the accom
21 and the thrust washer 26 and the knob.
panying drawings, in which:
The traveler 13 has thread following means engaged
FIG. 1 is a side elevational view to approximate scale
with the external threads of screw shaft 19 for transla
of an embodiment of the attachment of the present in~ 45 tion longitudinally of the frame means 11 and, for this
purpose, may be provided with an internally-threaded
venticn, showing in dotted lines portions of a transit to
through hole 29 through which is threadably engaged the
which it is mounted for use;
threaded section of the screw shaft 19. Means are pro
FIG. 2 is an enlarged perspective view of the attach
ment shown in FIG. 1, depicting in dotted lines parts 50 vided to permit the traveler 13 to slide along the frame
plate 15 while preventing relative rotation, so as to cause
of the transit and of a chain tape associated with the
the traveler to be translated along the threaded section of
the screw shaft 19 when the latter is rotated. For this
purpose the traveler 13 may be in the form of a block 30
3——3 of1FIG. 1;
having an inner vertical side face 31 juxtaposed closely to
FIG. 4 is a top plan view of the attachment structure 55 or in sliding contact with the frame plate outside face 15.
shown in FIGS. 1 and 3, depicting in dotted lines parts of
The traveler block 30 also preferably has a ?at top face
the transit telescope axle and one of the standards through
,32 provided with a transverse index mark 33‘ which, if
which the latter is journaled;
desired, may be in the form of a ?ne groove.
FIG. 5 is a side elevational diagrammatic view of a
Chain pillow means 34, to serve as a chain rest or
pair of transits equipped with such attachments not de 60 cradle, is carried by the traveler ‘block 30' and may, if
attachment;
FIG. 3 is a sectional view taken substantially on line
picted therein, illustrating use thereof in the chaining of
desired, be made integral therewith to simplify manufac
a line between remote stations A and B a plurality of
.ture. The chain pillow means 34 in the FIGS. 1 to 4
incl. embodiment is in the form of an upwardly tapered
chains apart;
body having oppositely sloped, oblique side faces 35, 35
FIG. 6 is a side elevational view, with parts broken
away and others indicated in dotted lines, of the pair 65 meeting in a lateral, transversely-extending apex edge 36.
A chain, such as the conventional ?at tape type indicated
transits illustrated in FIG. 5, depicting use thereof in the
in dotted lines at 37 in FIG. 2, is to be rested upon the
chaining of the distance from station A to the ?rst set-up
pillow apex 36 for drag thereover. Since the top face
point there succeeding;
32 in the structural embodiment illustrated in FIGS. 1
FIG. 7 is an enlarged plan view, with parts broken 70 to
4 incl. is to be aligned with the axis of the telescope
away, of either of the two chaining attachments shown in
axle to which this accessory or attachment is to he ?xedly
FIG. 6, illustrating correct association of a portion of
mounted, the apex 36 of the chain pillow 34 is located
3,088,464
3
4
substantially at the plane thereof, but preferably is offset
or disposed below this top face a distance t, indicated in
FIG. 3, which is the average thickness of such conven
In order to facilitate adjustment of the traveler block
30 to the “0” position with its index mark 33 aligned
with the telescope axle axis 46, the head 50 of screw 45
tional chain tapes, thereby permitting the top face of
may, if desired, be provided with an axial drill hole or
the tape at the pillow apex to be substantially aligned
with the traveler block top face and index mark 33 on
dimple 60, as is best seen in FIG. 2. Also, this align
ment may be facilitated by the provision of a vertical
mark or line 61 on the face 15 of frame plate 14 aligned
the latter.
~
7
with such drill hole 60.
The accessory or attachment 10 of the present inven
So that one may appreciate readily some of the ad
tion is to be ?xedly mounted to one end of the conven
tional telescope axle of a transit. The telescope of such 10 vantages attainable by use of the accessory or attach
a transit is indicated in dotted lines at 38 in FIGS. 1 and
ment 16 of the present invention, let it be assumed that
it has been ?xedly mounted to one end of the telescope
3 which, as is suggested in FIG. 1 will include the usual
back end eyepiece 39 and the front end 40. The tele
axle of a transit in a suitable manner, such as is proposed
in FIG. 3, and that two such transits have been so
scope axle may, in conventional manner, be in the form
of a pair of stub shafts 41 and 42, each rotatably sup 15 equipped with such device. In FIG. 5 is diagrammati
cally illustrated the measuring of a line with the use of
ported by a conventional standard structure 43, as is
these two transits there identi?ed as “Gun #1” and “Gun
indicated in dotted lines in FIG. 3. Since the accessory
#2.” The distance between remote station A and sta
10 is to be ?xedly mounted upon the telescope axle, the
tion B is to be measured and this distance, for example,
stub shaft 42 may, for this purpose, be provided with an '
internally-threaded hole 44 adapted threadably to receive 20 may be two plus (2+) chains. Thus, instead of trans
ferring the positions of the ends of the chain tape to the
the externally-threaded shank of a screw 45 which will
have its axis substantially aligned with the axle axis 46.
ground by means of plumb bobs or to previously placed
stakes by actual contact, the positions of set-ups are trans
The outer end 47 of stub shaft 42 may be in the form of
ferred directly to the accessories or attachments with
a ?at face against which is abutted a washer 48 arranged
about the shank of screw 45 and in turn against which 25 which the two transits have been equipped. Advan—
the inside vertical face 49 of frame plate 14 is abutted.
tageously the transits, while being of conventional con
struction, should be mounted on low tripods so that the
Screw 45 has an enlarged head 50 which is seated in a
horizontal axles thereof will be at convenient working
counter-sunk recess 51 in the outside face 15 of vertical
heights, such as about waist-high or slightly lower. Pref
frame plate 14 with the screw shank extending through a
hole 52 in this plate. By such means the accessory frame 30 erably, each accessory or attachment 10 is mounted to
the right side of the telescope of each transit and the
means 11 is securely mounted to the outer end 47 of the
note keeping and subsequent calculations are simpli?ed if
axle stub shaft 42. This mount of the accessory 19 is
the dimensions of the horizontal axles of the two transits
to be of a ?xed nature so that the accessory will rotate
are the same. The adjustment of the vertical circle of
with the telescope axle. This ?xed relationship may be
attained by the employment of a drift pin 53v extended 35 each transit is important. Also, in the method of meas
through aligned holes in the frame plate 14, the thrust
urement practiced with such accessory-equipped transits,
washer 48 and into the outer end of axle stub shaft 42,
as is indicated in FIG. 3. Any desired equivalent means
the chain tape, which may be of conventional length, e.g.,
one hundred feet (100’), two hundred feet (200") or
?fty meters (50 m.), is supported only at each end, and
may be employed ?xedly to mount such frame means to '
- an end of telescope shaft structure in practice of the in 40 thus the control of the tension applied thereto as it is
stretched from the accessory on one transit to the acces
vention, either by the transit manufacturer or by one who
sory on the other transit is important. Measurements re
possesses a conventional transit to'which he may wish to
quiring an extreme degree of accuracy dictate consider
>
'
_
ation of the change in the straight line distance between
This ?xed mount of the accessory 10 to one end of the
telescope axle is to be such that the index mark 33 on the 45 the reference marks on the end sections of the chain tape,
such as “0” and “100,” as the vertical angle changes from
top face 32 of the traveler block 30 will be aligned with
the horizontal.
the telescope axle axis 46 in the “0” position of the
In measuring the line from the station A to the station
traveler block, as maybe understood from FIG. 3. Also,
B, one transit (Gun #1) is carefully set up over the start
when the accessory 10 is ?xedly mounted in this manner,
or by any other suitable means, to the end of the tele 50 ing point at station A and the telescope 38 thereof is
sighted on station B. The chain tape is then stretched
scope axle it is also intended that when the traveler block
toward station B and a point is set on the line at the ?rst
130 is translated longitudinally of the frame means 11, i.e.,
add such accessory.
chain length in the vicinity of temporary intervening sta
tion X. In setting this point, the chain tape should be
parallel relation to the optical axis of the telescope, indi 55 held at a convenient working height and since this is only
along the vertical outside face 15 of the frame plate 14,
the top face 32 of the traveler block is to move along in
cated at 54 in FIGS. 1 and 3. Thus, the pillow apex 36
which is offset laterally to one side of the telescope optical
a temporary point, it will be sufficiently accurate if it is
set within about four hundredths of a foot (0.04’) of the
true chain length. The second transit (Gun #2) is now
set up solidly over the temporary point at temporary in
allel to this telescope axis in a plane which is located at
the small distance t below a plane having as line elements 60 tervening station X, leveled up and sighted back upon
the intersection of the telescope 38 and its horizontal axle
the intersecting telescope axle axis 46 and the telescope
axis 54 will be translated along a path substantially par- _
optical axis 54. >
In order'to eliminate backlash between, the threads of
the threaded section of screw shaft 19 and the internal
threads of the hole 29 through the traveler block 30,
spring means may be interposed between the traveler
block and one of the support arms 16 and 17, and, if de
sired, such spring means may be located on opposite sides
of the traveler ‘block but one such biasing spring device
of transit (Gun #1) ‘at station A, making certain that all
clamps are secure. This back sighting of the second
transit (Gun #2) at X is indicated in FIG. 5 by the
orientation of the dotted line showing thereat of telescope
138, its front end 140 and its eyepiece 139. The vertical
angle and the temperature at the second transit (Gun #2)
are now observed and recorded. The telescope 38 of the
transit (Gun #1) at station A is now sighted on the in
will serve the purpose. Such spring means may be in the 70 tersection of the telescope 138 and its horizontal axle of
the transit (Gun #2) at temporary intermediate station
formof a helical compression spring 55 having one ‘end
X. After making certain that all clamps of transit (Gun
56 .abutted against the inner face 57 of support arm 16
#1) are secure, the vertical angle and temperature at sta
and its other end 58 abutted against the opposite face ‘59
tion A are also observed and recorded. As a result, the
of the traveler block 30, with the turns thereof arranged
about screw shaft 19.
‘
75 set up depicted in FIG. 6 is attained.
5
3,083,464
With the telescope 38 of the ?rst transit (Gun #1) at
station A sighting forward and the telescope ‘138 of the
second transit (Gun #2) at intervening temporary station
X sighted back, it will be seen from FIG. 6 that the ac
6
sighting back along the line in the same direction, the
accessories or attachments 10, 10 will be on the same far
sides of the transit telescopes, as viewed in FIG. 5. Thus,
the measurement with the chain tape will be effected
cessory or attachment 10 mounted on the ?rst transit at
along the same side of the line without cross over and
station A is on the near side as viewed in FIG. 6, but
that this accessory or attachment mounted on the second
transit at station X is on the far side of telescope 138.
no compensating calculation is required, it being remem
bered that the transit at station X was changed in no way
after the ?rst chaining measurement. This second chain
Thus, the telescope 138 has been shown in dotted lines
length measurement will thus be made from a point
in FIG. 6 in order more clearly to see the accessory or 10 exactly one full chain length forward of station A since
attachment 10 associated therewith, the back face 49 of
the pillow apex 36 at station X had been moved forward
the frame plate =14 thereof being nearest the observer.
the distance d and will now be used for alignment there
The chain tape 37 is now brought into position for ac
with of the “0” on the back end portion 62 of the tape
curate measurement of the distance between the stations
37 as the latter is pulled forward to temporary interven
A and X. It may be desirable to stretch the chain tape 15 ing station Y. Let it be assumed that temporary inter
37 from station A to station X on the same side of the
vening stations X and Y are a distance apart slightly
two transits (Gun #1 and Gun #2) by locating the “0”
greater than one full chain length, thus plus distance be
reference mark at the rear end of the tape opposite the
ing d’. The knob 28 of the accessory or attachment 10
usual drill hole on the center of the end of the left side
on the ?rst transit (Gun #1) which is now set up attem
we stub shaft of the transit at station A and slidably rest
porary intervening station Y will be manipulated to back
ing the front end of the tape on the pillow apex of the at
up its traveler block 30 until the pillow apex 36 carried
tachment 19 mounted on the transit at station X and
thereby is aligned with the forward reference mark “*100”
pulling the tape to the desired tautness thereover. How
on the front end portion '64 of the tape. Thus, while
ever, since it is proper to cross the tape over from one
the transit at temporary intervening station Y (Gun #1)
side of the line to the other in effecting such a measure 25 has been located forward from station A a distance equal
ment, the compensating calculation to accommodate this
angular relationship being readily made, such stretching
of the tape is illustrated in FIG. 6 for clarity of illustra
tion and ready understanding.
to the sum of one chain length minus the distance d,
and another full chain length plus the distance d’, these
variations need not be taken into consideration in the
taking of notes since the pillow apex 36 on the transit
As is indicated in FIG. 6, the rear end 62 of the chain 30 (Gun #1) at temporary intervening station Y has been
tape 37 will be rested over the apex 36 of the pillow 34
adjusted to be exactly two chain lengths forward of sta
of the attachment 19 at station A and held ?rmly with
tion A by this chaining procedure. The next and ?nal
its reference mark “0,” indicated at 63 in FIG. 7, aligned
steps of measuring the line between stations A and B is
with pillow apex 36 and the mark 61 on the face 15 of
then performed as follows.
frame plate 14. The tape front end 64 will be rested 35
When the pillow apex 36 of the accessory or attachment
upon the pillow apex 36 of the other accessory or attach
1% on the transit (Gun #1) at temporary intervening
ment 11% mounted on the transit at station X and pulled
station Y has now been adjusted to be exactly two chain
forward thereover to suitable tautness. The instrument
lengths forward from station A, the clamps of the transit
man operating the transit at station X will then reach
(Gun #2), which is now the rear one at station X, can
forward along the side of the telescope 138 and manipu 40 be released and its telescope 138 then sighted forward
late the manual knob 28 to translate the traveler block
with its cross hairs aligned on the intersection of the
13 of the accessory \16 on the second transit (Gun #2)
telescope and horizontal axle of the transit (Gun #1) at
until the pillow apex 36 is brought to alignment with the
temporary intervening station Y. The vertical angle of
reference mark on the forward end 64 of the tape, as is
and temperature at transit (Gun #2) at station X are
also indicated at 163 in FIG. 7. In FIG. 7 both of the 45 then observed and recorded. Now transit (Gun #2) is
reference marks “0” and “100” on opposite ends of the
picked up and moved forward to station B which is as
tape 37 are depicted by the common character “Z.” It
surned to be (x ft.) less than one full chain length for
will be noted from FIG. 6 that actually the second transit
ward of temporary intervening station Y. With set up of
(Gun #2) was set up over a point short of a complete
the transit (Gun #2) at station B and exact alignment of
chain length the short distance d. While this chaining 50 its plumb bob over the station B point, the traveler block
is being accomplished the temperature of the air at the
39 of the accessory or attachment 10 mounted on this
middle of the chain tape 37 can be observed by swinging
transit (Gun #2) can then be adjusted by manipulation
a thermometer there at the height of the tape. With the
of the manual knob 28 to bring the pillow apex 36 back
second transit (Gun #2.) remaining in its set up position
to exact alignment with the axle axis of telescope 138.
at temporary intervening station X, the next step in the 55 With telescope 138 sighted back on the intersection of
measurement of the distance between stations A and B
telescope 38 and the axle of the transit (Gun #1) at tem
is then performed in the following manner.
porary intervening station Y, the chain tape 37 will then
be pulled over the chain pillows 34, 34 of the two attach
The ?rst transit (Gun #1) at station A is then moved
ments, and with the reference mark “0” on the back end
forward beyond the second transit at temporary interven
ing station X to approximately a chain length therefrom 60 62 of the chain tape aligned with the pillow apex 36 of
the adjusted traveler block 30 on the transit (Gun #1) at
at temporary intervening station Y and set up in the man
station Y the exact measurement between it and the pillow
ner described with respect to the second transit at station
apex 36 aligned precisely over station B point will be
X. The ?rst transit (Gun #1) at temporary intervening
directly read from the tape. This will give the exact dis
station Y is then sighted back upon the second transit
(Gun #2), which remained without change at temporary 65 tance between stations A and B as two full chains, plus
one chain minus (x ft.).
intervening station X, in the same manner as was the
It will thus be seen that no precise measuring of the ex
sighting of the latter upon the ?rst transit when set up at
act distances between station A and temporary intervening
station A. With all clamps secure, the vertical angle and
station X, and between the latter and temporary interven
temperature at the transit (Gun #1) at temporary inter
vening station Y are observed and recorded. Now the 70 ing station Y, was necessary to the determination of the
exact distance between the stations A and B. The manipu
distance is chained between the temporary intervening
lations of the accessories or attachments 16, 10 mounted
stations X and Y by using in the previously described
on the two transits (Gun #1 and Gun #2) automatically
manner the accessories or attachments 10, 10 of the two
accommodated the differences between exact chain lengths
transits. In this procedure, since the telescopes 38 and
138 of both of the transits (Gun #1 and Gun #2) are 75 and the true distances between the starting point and the
3,083,464
8
7
temporary intervening stations without requiring any book
traveler having an apex transversely aligned with the
telescope axle axis and the telescope optical axis for travel
along the latter in substantially parallel relation thereto
recording of any measured intervening distances. if it is
required to get the plus distance to a point along the
line during such chaining procedure, this can be accom
when said screw means is rotated, the apex of said pillow
plished easily by measuring the distance to the point from
the index mark provided on the attachment by the pillow
slidably rested thereon and held against longitudinal
means being alignable with a reference mark on a chain
apex. This measured distance is the hypotenuse of a
right triangle with one leg thereof being the distance at
the apex index mark from the center line of the telescope
movement.
1
2. A chaining attachment or accessory mounted on a ‘
surveyor’s transit having a conventional telescope pivotal
and with the other leg thereof being the required plus dis 10 ly supported on a transverse axle comprising, in combina
tance which can be obtained by computation.
The device of the present invention when mounted upon
a transit and used in the manner proposed permits prac
tice of a simple and direct Way of measuring a line and at
the same time retaining a very high degree of accuracy. 15
said transit with said plate extending longitudinally along
With the use of a pair of transits so equipped and the line
measured in the manner indicated on the incline, due to
one side of the optical axis of the telescope, an elongated
translating screw supported by said arms for free rota
di?erences in elevations of the set up points, the vertical
angle is measured at each end of the chain tape length
tion without longitudinal translation relative thereto, the
tion with said transit; of an elongated frame plate hav
ing a pair of support arms extending angularly therefrom
and spaced longitudinally thereof, means ?xedly mounting
said frame plate to an end of the axle of the telescope of
axis of said screw being parallel to and to one side of
thus affording a check on the angle. The horizontal com
20v the telescope optical axis with said frame plate mounted
ponent of the tape length is the inclined distance multi
?xedly to the end of the telescope axle, hand grasp means
plied by the cosine of the mean of the two vertical angles.
carried by said screw for manual rotation thereof, a trav
If the vertical component is needed it is the chain tape
eler block having screw thread following means engaged
length multiplied by the sine of the mean of the two
with said screw, means to permit said block to slide along
vertical angles. All measurements are taken at a con 25 said frame plate while preventing relative rotation for
venient working height which is an important factor in
causing said block to be translated along said screw paral
performing ?eld work. The only critical requirement of
lel to the telescope optical axis upon manual rotation of
transits equipped with devices of the present invention is
said screw, and an upwardly-tapered chain pillow carried
- that the vertical circle and the bubble of each must be in
by said block having a transversely-extending lateral
precise adjustment.
Advantageous use of the accessory or attachment of
the present invention may be enhanced by a modified
30 apex over which a chain is to be stretched to alignment
therewith of a reference mark on the chain, said pillow
apex being located substantially in a lateral plane which
form thereof, such as that illustrated in FIG. 8. As there
includes as line elements the telescope axle axis and the
in proposed, the accessory or attachment 110 may be like
telescope optical axis for longitudinal translation along
that illustrated in FIGS. 1 to 4 incl. except that the 35 the latter upon manual manipulation of said screw.
frame plate 114 may have its outside vertical face 115
3. The chaining attachment as de?ned in claim 2 char
provided with a measuring scale 65 having an “0” mark
acterized by said frame plate having a longitudinally
66 at the position of the “0” mark 61 of the other em
extending ?at face, said frame plate mounting means be
bodiment, and with the pillow body 134 of the traveler
ing of a construction to ?x said plate to the end of the
block 130 modi?ed in shape so that the apex 136 is at the 40 telescope axle with said ?at face arranged in a vertical
high part of a rounded nose 67. The latter feature avoids
plane, said screw being rotatably mounted laterally to the
the tendency of a chain tape to be sharply bent at the
side of said ?at face for translation along the latter of
pillow apex which may exist when the latter is the sharp
said pillow apex, and an elongated measurement scale
edge of a wedge-shaped body, such as 34 of the FIGS. 1
carried by said ?at face and oriented to be arranged sub
to 4 incl. embodiment.
45 stantially parallel to the telescope optical axis with the
It will thus be seen that the objects set forth above,
pillow apex being translatable along said scale for direct
among those made apparent from the preceding descrip
reading of the distance of adjustment of the pillow apex
tion, are e?iciently attained and, since certain changes
along the telescope optical axis by screw manipulation.
may be made in the above constructions without depart
4. A chaining attachment or accessory mounted on a
ing from the scope of the invention, it is intended that all 50 surveyor’s transit having a conventional telescope pivotal
matter contained in the above description or shown in the
ly supported on a transverse axle comprising, in combina
accompanying drawings shall be interpreted as illustrative
tion with said transit; of an elongated ?at frame plate
and not in a limiting sense.
.
having a longitudinally-extending, vertical outside face;
It is also to be understood that the following claims
a pair of longitudinally-spaced, substantially parallel arms
are intended to cover all of the generic and speci?c fea 55 mounted on said frame plate and extending laterally out
tures of the invention herein described, and all statements
ward from the vertical face thereof; attaching means fix
of the scope of the invention which, as a matter of lan
edly mounting said frame plate to one end of the axle
guage, might be said to fall therebetween.
of said transit telescope with the outside face thereof ar
Having described my invention, what I claim as new
ranged substantially normal to the axle axis and extending
and desire to secure by Letters Patent is:
60 longitudinally along one side and laterally of the optical
l. A chaining attachment or accessory mounted on a
axis of the telescope; a pair of aligned bemings with each
surveyor’s transit having a conventional telescope pivotal
supported by one of said arms; an elongated translating
ly supported on a transverse axle comprising, in combina
screw having a pair of axially-spaced journals rotatably
tion with said transit, of elongated frame means, means
supported by said pair of bearings and a threaded section
?xedly mounting said frame means upon the axle of the 65 intervening said journals, said screw being located paral
telescope of said transit with said frame means extending
lel to the telescope optical axis and laterally to one side
longitudinally in the direction of the optical axis of the
thereof with said frame plate mounted ?xedly to the end
telescope, elongated translating screw means rotatably
of the telescope axle; a hand knob mounted on said
supported by said frame means with arrangement of the
screw for manual rotation thereof; a traveler block thread
axis of said screw means substantially parallel to the tele 70 ably engaged with the threaded section of said screw and
scope optical axis, means manually to rotate said screw
having a side face juxtaposed to the vertical face of said
means, a traveler having thread following means engaged
frame plate for slide therealong parallel to the telescope
by said screw means for translation longitudinally of said
frame means along a path substantially parallel to the
telescope axis, and chain pillow means carried by said,
optical axis upon manual rotation of said screw while
preventing rotation of said traveler block; spring means
interposed between said traveler block and one of said
3,083,464
10
arms preventing backlash between said block and the
screw threaded section; and an upwardly-tapered chain
pillow carried by said block having a transversely-extend
ing lateral apex over which a chain tape is to be stretched
to alignment therewith of a reference mark ‘on the chain,
said pillow apex being arranged as a line element in a
mounted on said translating means for travel therealong
longitudinally of said frame means along a path substan
tially parallel to the telescope axis, means to adjust the
position of said traveler along said translating means,
means temporarily to ?x said traveler in a selected one of
a plurality of adjusted positions along said translating
lateral plane parallel to and spaced the average thickness
of conventionl chain tapes below a lateral plane which
means with ?ne adjustment of the forward position of
said traveler relative to a chaining point over which said
transit is set up, and chain pillow means ?xedly carried
includes as line elements the telescope axle axis and the
telescope optical axis for longitudinal translation along 10 by said traveler having an apex transversely aligned with
the telescope optical axis for travel along the latter in
the telescope optical axis upon manual rotation of said
screw.
5. The chaining attachment or accessory as defined in
claim 4 characterized by an elongated measurement scale
substantially parallel relation thereto when said traveler
is adjusted along said translating means, the apex of said
pillow means providing a reference point for alignment
carried by said frame plate vertical face and oriented sub 15 therewith of a reference mark on a chain slidably rested
thereon and pulled tautly thereover while being held
stantially parallel to the telescope optical axis with the
against longitudinal movement with respect to another
pillow apex being translatable along said scale for direct
reading of the distance of adjustment of the pillow apex
remote chaining point.
along the telescope optical axis by screw rotation.
References Cited in the ?le of this patent
6. A chaining attachment or accessory mounted on a 20
surveyor’s transit having a conventional telescope pivot
UNITED STATES PATENTS
ally supported on a transverse axle comprising, in com
bination with said transit, of elongated frame means,
means ?xedly mounting said frame means upon the axle
of the telescope of said transit with said frame means ex 25
tending longitudinally in the direction of the optical axis
of the telescope, elongated translating means supported by
said frame means with arrangement of the axis of said
translating means substantially parallel to the telescope
380,740
437,308
2,706,336
Balsbaugh ___________ __ Apr. 10, 1888
Markham ____________ .._ Sept. 30, 1890
Gruber ______________ _._ Apr. 19, 1955
OTHER REFERENCES
Tracy: Surveying Theory and Practice, New York,
John Wiley & Sons, Inc., Fifth Printing, 1955, Fig. 716(b),
optical axis and normal to the axis of said axle, a traveler 30 page 856 relied on.
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